fix(android): drop jcenter to avoid warnings/errors in new Android Studio

Author: timmywil

README.md

@@ -182,7 +182,7 @@ See our [ASR documentation](https://www.spokestack.io/docs/concepts/asr) for mor
   dependencies {
     // Minimium gradle is 3.0.1+
     // The latest React Native already has this
-    classpath("com.android.tools.build:gradle:4.1.0")
+    classpath("com.android.tools.build:gradle:4.2.1")
 ```
 
 ### Edit AndroidManifest.xml

android/build.gradle

@@ -1,14 +1,14 @@
 buildscript {
   // Build script is evaluated before everything else so we can't use getExtOrDefault
-  def kotlin_version = rootProject.ext.has('kotlinVersion') ? rootProject.ext.get('kotlinVersion') : project.properties['Spokestack_kotlinVersion']
+  ext.kotlin_version = rootProject.ext.has('kotlinVersion') ? rootProject.ext.get('kotlinVersion') : project.properties['Spokestack_kotlinVersion']
 
   repositories {
     google()
-    jcenter()
+    mavenCentral()
   }
 
   dependencies {
-    classpath 'com.android.tools.build:gradle:4.1.0'
+    classpath 'com.android.tools.build:gradle:4.2.1'
     // noinspection DifferentKotlinGradleVersion
     classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
   }
@@ -47,7 +47,6 @@ android {
 
 repositories {
   mavenCentral()
-  jcenter()
   google()
 
   def found = false
@@ -128,6 +127,8 @@ dependencies {
   implementation 'org.tensorflow:tensorflow-lite:2.3.0'
 
   // for playback of TTS audio
-  implementation 'androidx.media:media:1.3.1'
-  implementation 'com.google.android.exoplayer:exoplayer-core:2.14.1'
+  implementation 'androidx.media:media:1.4.1'
+  implementation 'com.google.android.exoplayer:exoplayer-core:2.15.0'
+  implementation "androidx.core:core-ktx:+"
+  implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 }

android/gradle.properties

@@ -1,5 +1,5 @@
-Spokestack_kotlinVersion=1.4.21
+Spokestack_kotlinVersion=1.4.32
 Spokestack_kotlinxVersion=1.4.2
-Spokestack_compileSdkVersion=28
-Spokestack_buildToolsVersion=28.0.3
-Spokestack_targetSdkVersion=28
+Spokestack_compileSdkVersion=30
+Spokestack_buildToolsVersion=30.0.2
+Spokestack_targetSdkVersion=30